2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $
35 * Copyright (c) 1989 Stephen Deering
36 * Copyright (c) 1992, 1993
37 * The Regents of the University of California. All rights reserved.
39 * This code is derived from software contributed to Berkeley by
40 * Stephen Deering of Stanford University.
42 * Redistribution and use in source and binary forms, with or without
43 * modification, are permitted provided that the following conditions
45 * 1. Redistributions of source code must retain the above copyright
46 * notice, this list of conditions and the following disclaimer.
47 * 2. Redistributions in binary form must reproduce the above copyright
48 * notice, this list of conditions and the following disclaimer in the
49 * documentation and/or other materials provided with the distribution.
50 * 3. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93
67 * BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp
71 * IP multicast forwarding procedures
73 * Written by David Waitzman, BBN Labs, August 1988.
74 * Modified by Steve Deering, Stanford, February 1989.
75 * Modified by Mark J. Steiglitz, Stanford, May, 1991
76 * Modified by Van Jacobson, LBL, January 1993
77 * Modified by Ajit Thyagarajan, PARC, August 1993
78 * Modified by Bill Fenner, PARC, April 1994
80 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
83 #include <sys/cdefs.h>
84 __FBSDID("$FreeBSD$");
86 #include "opt_inet6.h"
88 #include <sys/param.h>
89 #include <sys/callout.h>
90 #include <sys/errno.h>
91 #include <sys/kernel.h>
93 #include <sys/malloc.h>
95 #include <sys/module.h>
96 #include <sys/domain.h>
97 #include <sys/protosw.h>
99 #include <sys/signalvar.h>
100 #include <sys/socket.h>
101 #include <sys/socketvar.h>
102 #include <sys/sockio.h>
104 #include <sys/sysctl.h>
105 #include <sys/syslog.h>
106 #include <sys/systm.h>
107 #include <sys/time.h>
110 #include <net/if_var.h>
111 #include <net/if_types.h>
112 #include <net/vnet.h>
114 #include <netinet/in.h>
115 #include <netinet/in_var.h>
116 #include <netinet/icmp6.h>
117 #include <netinet/ip_encap.h>
119 #include <netinet/ip6.h>
120 #include <netinet/in_kdtrace.h>
121 #include <netinet6/ip6_var.h>
122 #include <netinet6/scope6_var.h>
123 #include <netinet6/nd6.h>
124 #include <netinet6/ip6_mroute.h>
125 #include <netinet6/pim6.h>
126 #include <netinet6/pim6_var.h>
128 static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
130 static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
131 static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
132 static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
133 static int set_pim6(int *);
134 static int socket_send(struct socket *, struct mbuf *,
135 struct sockaddr_in6 *);
137 extern int in6_mcast_loop;
138 extern struct domain inet6domain;
140 static const struct encaptab *pim6_encap_cookie;
141 static int pim6_encapcheck(const struct mbuf *, int, int, void *);
142 static int pim6_input(struct mbuf *, int, int, void *);
144 static const struct encap_config ipv6_encap_cfg = {
145 .proto = IPPROTO_PIM,
146 .min_length = sizeof(struct ip6_hdr) + PIM_MINLEN,
148 .check = pim6_encapcheck,
152 VNET_DEFINE_STATIC(int, ip6_mrouter_ver) = 0;
153 #define V_ip6_mrouter_ver VNET(ip6_mrouter_ver)
155 SYSCTL_DECL(_net_inet6);
156 SYSCTL_DECL(_net_inet6_ip6);
157 static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim,
158 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
161 static struct mrt6stat mrt6stat;
162 SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
164 "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
166 #define MRT6STAT_INC(name) mrt6stat.name += 1
167 #define NO_RTE_FOUND 0x1
168 #define RTE_FOUND 0x2
170 static struct sx mrouter6_mtx;
171 #define MROUTER6_LOCKPTR() (&mrouter6_mtx)
172 #define MROUTER6_LOCK() sx_xlock(MROUTER6_LOCKPTR())
173 #define MROUTER6_UNLOCK() sx_xunlock(MROUTER6_LOCKPTR())
174 #define MROUTER6_LOCK_ASSERT() sx_assert(MROUTER6_LOCKPTR(), SA_XLOCKED
175 #define MROUTER6_LOCK_INIT() sx_init(MROUTER6_LOCKPTR(), "mrouter6")
176 #define MROUTER6_LOCK_DESTROY() sx_destroy(MROUTER6_LOCKPTR())
178 static struct mf6c *mf6ctable[MF6CTBLSIZ];
179 SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
180 &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
181 "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
182 "netinet6/ip6_mroute.h)");
184 static struct mtx mfc6_mtx;
185 #define MFC6_LOCKPTR() (&mfc6_mtx)
186 #define MFC6_LOCK() mtx_lock(MFC6_LOCKPTR())
187 #define MFC6_UNLOCK() mtx_unlock(MFC6_LOCKPTR())
188 #define MFC6_LOCK_ASSERT() mtx_assert(MFC6_LOCKPTR(), MA_OWNED)
189 #define MFC6_LOCK_INIT() mtx_init(MFC6_LOCKPTR(), \
190 "IPv6 multicast forwarding cache", \
192 #define MFC6_LOCK_DESTROY() mtx_destroy(MFC6_LOCKPTR())
194 static u_char n6expire[MF6CTBLSIZ];
196 static struct mif6 mif6table[MAXMIFS];
198 sysctl_mif6table(SYSCTL_HANDLER_ARGS)
200 struct mif6_sctl *out;
203 out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP,
205 for (int i = 0; i < MAXMIFS; i++) {
206 out[i].m6_flags = mif6table[i].m6_flags;
207 out[i].m6_rate_limit = mif6table[i].m6_rate_limit;
208 out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr;
209 if (mif6table[i].m6_ifp != NULL)
210 out[i].m6_ifp = mif6table[i].m6_ifp->if_index;
213 out[i].m6_pkt_in = mif6table[i].m6_pkt_in;
214 out[i].m6_pkt_out = mif6table[i].m6_pkt_out;
215 out[i].m6_bytes_in = mif6table[i].m6_bytes_in;
216 out[i].m6_bytes_out = mif6table[i].m6_bytes_out;
218 error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS);
222 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table,
223 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
224 NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]",
225 "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], "
226 "netinet6/ip6_mroute.h)");
228 static struct mtx mif6_mtx;
229 #define MIF6_LOCKPTR() (&mif6_mtx)
230 #define MIF6_LOCK() mtx_lock(MIF6_LOCKPTR())
231 #define MIF6_UNLOCK() mtx_unlock(MIF6_LOCKPTR())
232 #define MIF6_LOCK_ASSERT() mtx_assert(MIF6_LOCKPTR(), MA_OWNED)
233 #define MIF6_LOCK_INIT() \
234 mtx_init(MIF6_LOCKPTR(), "IPv6 multicast interfaces", NULL, MTX_DEF)
235 #define MIF6_LOCK_DESTROY() mtx_destroy(MIF6_LOCKPTR())
238 VNET_DEFINE_STATIC(u_int, mrt6debug) = 0; /* debug level */
239 #define V_mrt6debug VNET(mrt6debug)
240 #define DEBUG_MFC 0x02
241 #define DEBUG_FORWARD 0x04
242 #define DEBUG_EXPIRE 0x08
243 #define DEBUG_XMIT 0x10
244 #define DEBUG_REG 0x20
245 #define DEBUG_PIM 0x40
246 #define DEBUG_ERR 0x80
247 #define DEBUG_ANY 0x7f
248 #define MRT6_DLOG(m, fmt, ...) \
249 if (V_mrt6debug & (m)) \
250 log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \
251 "%s: " fmt "\n", __func__, ##__VA_ARGS__)
253 #define MRT6_DLOG(m, fmt, ...)
256 static void expire_upcalls(void *);
257 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
258 #define UPCALL_EXPIRE 6 /* number of timeouts */
261 * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
265 * 'Interfaces' associated with decapsulator (so we can tell
266 * packets that went through it from ones that get reflected
267 * by a broken gateway). Different from IPv4 register_if,
268 * these interfaces are linked into the system ifnet list,
269 * because per-interface IPv6 statistics are maintained in
270 * ifp->if_afdata. But it does not have any routes point
271 * to them. I.e., packets can't be sent this way. They
272 * only exist as a placeholder for multicast source
275 static struct ifnet *multicast_register_if6;
277 #define ENCAP_HOPS 64
282 static mifi_t nummifs = 0;
283 static mifi_t reg_mif_num = (mifi_t)-1;
285 static struct pim6stat pim6stat;
286 SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW,
288 "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)");
290 #define PIM6STAT_INC(name) pim6stat.name += 1
291 VNET_DEFINE_STATIC(int, pim6);
292 #define V_pim6 VNET(pim6)
295 * Hash function for a source, group entry
297 #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
298 (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
299 (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
300 (g).s6_addr32[2] ^ (g).s6_addr32[3])
303 * Find a route for a given origin IPv6 address and Multicast group address.
305 #define MF6CFIND(o, g, rt) do { \
306 struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
309 if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
310 IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
311 (_rt->mf6c_stall == NULL)) { \
315 _rt = _rt->mf6c_next; \
318 MRT6STAT_INC(mrt6s_mfc_misses); \
320 } while (/*CONSTCOND*/ 0)
323 * Macros to compute elapsed time efficiently
324 * Borrowed from Van Jacobson's scheduling code
325 * XXX: replace with timersub() ?
327 #define TV_DELTA(a, b, delta) do { \
330 delta = (a).tv_usec - (b).tv_usec; \
331 if ((xxs = (a).tv_sec - (b).tv_sec)) { \
340 delta += (1000000 * xxs); \
343 } while (/*CONSTCOND*/ 0)
345 /* XXX: replace with timercmp(a, b, <) ? */
346 #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
347 (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
350 #define UPCALL_MAX 50
351 static u_long upcall_data[UPCALL_MAX + 1];
352 static void collate();
353 #endif /* UPCALL_TIMING */
355 static int ip6_mrouter_init(struct socket *, int, int);
356 static int add_m6fc(struct mf6cctl *);
357 static int add_m6if(struct mif6ctl *);
358 static int del_m6fc(struct mf6cctl *);
359 static int del_m6if(mifi_t *);
360 static int del_m6if_locked(mifi_t *);
361 static int get_mif6_cnt(struct sioc_mif_req6 *);
362 static int get_sg_cnt(struct sioc_sg_req6 *);
364 static struct callout expire_upcalls_ch;
366 int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
367 int X_ip6_mrouter_done(void);
368 int X_ip6_mrouter_set(struct socket *, struct sockopt *);
369 int X_ip6_mrouter_get(struct socket *, struct sockopt *);
370 int X_mrt6_ioctl(u_long, caddr_t);
373 * Handle MRT setsockopt commands to modify the multicast routing tables.
376 X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
384 if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
387 switch (sopt->sopt_name) {
392 error = sooptcopyin(sopt, &optval, sizeof(optval),
396 error = ip6_mrouter_init(so, optval, sopt->sopt_name);
399 error = X_ip6_mrouter_done();
402 error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
405 error = add_m6if(&mifc);
408 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
411 error = add_m6fc(&mfcc);
414 error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
417 error = del_m6fc(&mfcc);
420 error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
423 error = del_m6if(&mifi);
426 error = sooptcopyin(sopt, &optval, sizeof(optval),
430 error = set_pim6(&optval);
441 * Handle MRT getsockopt commands
444 X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
448 if (so != V_ip6_mrouter)
451 switch (sopt->sopt_name) {
453 error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
460 * Handle ioctl commands to obtain information from the cache
463 X_mrt6_ioctl(u_long cmd, caddr_t data)
470 case SIOCGETSGCNT_IN6:
471 ret = get_sg_cnt((struct sioc_sg_req6 *)data);
474 case SIOCGETMIFCNT_IN6:
475 ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
486 * returns the packet, byte, rpf-failure count for the source group provided
489 get_sg_cnt(struct sioc_sg_req6 *req)
498 MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
502 req->pktcnt = rt->mf6c_pkt_cnt;
503 req->bytecnt = rt->mf6c_byte_cnt;
504 req->wrong_if = rt->mf6c_wrong_if;
513 * returns the input and output packet and byte counts on the mif provided
516 get_mif6_cnt(struct sioc_mif_req6 *req)
526 if (mifi >= nummifs) {
529 req->icount = mif6table[mifi].m6_pkt_in;
530 req->ocount = mif6table[mifi].m6_pkt_out;
531 req->ibytes = mif6table[mifi].m6_bytes_in;
532 req->obytes = mif6table[mifi].m6_bytes_out;
543 if ((*i != 1) && (*i != 0))
552 * Enable multicast routing
555 ip6_mrouter_init(struct socket *so, int v, int cmd)
558 MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d",
559 so->so_type, so->so_proto->pr_protocol);
561 if (so->so_type != SOCK_RAW ||
562 so->so_proto->pr_protocol != IPPROTO_ICMPV6)
566 return (ENOPROTOOPT);
570 if (V_ip6_mrouter != NULL) {
576 V_ip6_mrouter_ver = cmd;
578 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
579 bzero((caddr_t)n6expire, sizeof(n6expire));
581 V_pim6 = 0;/* used for stubbing out/in pim stuff */
583 callout_init_mtx(&expire_upcalls_ch, MFC6_LOCKPTR(), 0);
584 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
585 expire_upcalls, NULL);
589 MRT6_DLOG(DEBUG_ANY, "finished");
595 * Disable IPv6 multicast forwarding.
598 X_ip6_mrouter_done(void)
607 if (V_ip6_mrouter == NULL) {
613 * For each phyint in use, disable promiscuous reception of all IPv6
616 for (mifi = 0; mifi < nummifs; mifi++) {
617 if (mif6table[mifi].m6_ifp &&
618 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
619 if_allmulti(mif6table[mifi].m6_ifp, 0);
622 bzero((caddr_t)mif6table, sizeof(mif6table));
625 V_pim6 = 0; /* used to stub out/in pim specific code */
628 * Free all multicast forwarding cache entries.
631 for (i = 0; i < MF6CTBLSIZ; i++) {
636 for (rte = rt->mf6c_stall; rte != NULL; ) {
637 struct rtdetq *n = rte->next;
640 free(rte, M_MRTABLE6);
645 free(frt, M_MRTABLE6);
648 bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
651 callout_drain(&expire_upcalls_ch);
654 * Reset register interface
656 if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
657 if_detach(multicast_register_if6);
658 if_free(multicast_register_if6);
659 reg_mif_num = (mifi_t)-1;
660 multicast_register_if6 = NULL;
663 V_ip6_mrouter = NULL;
664 V_ip6_mrouter_ver = 0;
667 MRT6_DLOG(DEBUG_ANY, "finished");
672 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
675 * Add a mif to the mif table
678 add_m6if(struct mif6ctl *mifcp)
686 if (mifcp->mif6c_mifi >= MAXMIFS) {
690 mifp = mif6table + mifcp->mif6c_mifi;
691 if (mifp->m6_ifp != NULL) {
693 return (EADDRINUSE); /* XXX: is it appropriate? */
695 if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
700 ifp = ifnet_byindex(mifcp->mif6c_pifi);
702 if (mifcp->mif6c_flags & MIFF_REGISTER) {
703 if (reg_mif_num == (mifi_t)-1) {
704 ifp = if_alloc(IFT_OTHER);
706 if_initname(ifp, "register_mif", 0);
707 ifp->if_flags |= IFF_LOOPBACK;
709 multicast_register_if6 = ifp;
710 reg_mif_num = mifcp->mif6c_mifi;
712 * it is impossible to guess the ifindex of the
713 * register interface. So mif6c_pifi is automatically
716 mifcp->mif6c_pifi = ifp->if_index;
718 ifp = multicast_register_if6;
721 /* Make sure the interface supports multicast */
722 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
727 error = if_allmulti(ifp, 1);
734 mifp->m6_flags = mifcp->mif6c_flags;
737 /* initialize per mif pkt counters */
739 mifp->m6_pkt_out = 0;
740 mifp->m6_bytes_in = 0;
741 mifp->m6_bytes_out = 0;
743 /* Adjust nummifs up if the mifi is higher than nummifs */
744 if (nummifs <= mifcp->mif6c_mifi)
745 nummifs = mifcp->mif6c_mifi + 1;
748 MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi,
755 * Delete a mif from the mif table
758 del_m6if_locked(mifi_t *mifip)
760 struct mif6 *mifp = mif6table + *mifip;
766 if (*mifip >= nummifs)
768 if (mifp->m6_ifp == NULL)
771 if (!(mifp->m6_flags & MIFF_REGISTER)) {
772 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
776 if (reg_mif_num != (mifi_t)-1 &&
777 multicast_register_if6 != NULL) {
778 if_detach(multicast_register_if6);
779 if_free(multicast_register_if6);
780 reg_mif_num = (mifi_t)-1;
781 multicast_register_if6 = NULL;
785 bzero((caddr_t)mifp, sizeof(*mifp));
787 /* Adjust nummifs down */
788 for (mifi = nummifs; mifi > 0; mifi--)
789 if (mif6table[mifi - 1].m6_ifp)
792 MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs);
798 del_m6if(mifi_t *mifip)
803 cc = del_m6if_locked(mifip);
813 add_m6fc(struct mf6cctl *mfccp)
819 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
823 MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
824 mfccp->mf6cc_mcastgrp.sin6_addr, rt);
826 /* If an entry already exists, just update the fields */
828 MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x",
829 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
830 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
831 mfccp->mf6cc_parent);
833 rt->mf6c_parent = mfccp->mf6cc_parent;
834 rt->mf6c_ifset = mfccp->mf6cc_ifset;
841 * Find the entry for which the upcall was made and update
843 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
844 mfccp->mf6cc_mcastgrp.sin6_addr);
845 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
846 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
847 &mfccp->mf6cc_origin.sin6_addr) &&
848 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
849 &mfccp->mf6cc_mcastgrp.sin6_addr) &&
850 (rt->mf6c_stall != NULL)) {
853 "add_m6fc: %s o %s g %s p %x dbx %p\n",
854 "multiple kernel entries",
856 &mfccp->mf6cc_origin.sin6_addr),
858 &mfccp->mf6cc_mcastgrp.sin6_addr),
859 mfccp->mf6cc_parent, rt->mf6c_stall);
861 MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p",
863 &mfccp->mf6cc_origin.sin6_addr),
865 &mfccp->mf6cc_mcastgrp.sin6_addr),
866 mfccp->mf6cc_parent, rt->mf6c_stall);
868 rt->mf6c_origin = mfccp->mf6cc_origin;
869 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
870 rt->mf6c_parent = mfccp->mf6cc_parent;
871 rt->mf6c_ifset = mfccp->mf6cc_ifset;
872 /* initialize pkt counters per src-grp */
873 rt->mf6c_pkt_cnt = 0;
874 rt->mf6c_byte_cnt = 0;
875 rt->mf6c_wrong_if = 0;
877 rt->mf6c_expire = 0; /* Don't clean this guy up */
880 /* free packets Qed at the end of this entry */
881 for (rte = rt->mf6c_stall; rte != NULL; ) {
882 struct rtdetq *n = rte->next;
883 ip6_mdq(rte->m, rte->ifp, rt);
887 #endif /* UPCALL_TIMING */
888 free(rte, M_MRTABLE6);
891 rt->mf6c_stall = NULL;
896 * It is possible that an entry is being inserted without an upcall
899 MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash,
900 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
901 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
902 mfccp->mf6cc_parent);
904 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
905 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
906 &mfccp->mf6cc_origin.sin6_addr)&&
907 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
908 &mfccp->mf6cc_mcastgrp.sin6_addr)) {
909 rt->mf6c_origin = mfccp->mf6cc_origin;
910 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
911 rt->mf6c_parent = mfccp->mf6cc_parent;
912 rt->mf6c_ifset = mfccp->mf6cc_ifset;
913 /* initialize pkt counters per src-grp */
914 rt->mf6c_pkt_cnt = 0;
915 rt->mf6c_byte_cnt = 0;
916 rt->mf6c_wrong_if = 0;
924 /* no upcall, so make a new entry */
925 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
932 /* insert new entry at head of hash chain */
933 rt->mf6c_origin = mfccp->mf6cc_origin;
934 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
935 rt->mf6c_parent = mfccp->mf6cc_parent;
936 rt->mf6c_ifset = mfccp->mf6cc_ifset;
937 /* initialize pkt counters per src-grp */
938 rt->mf6c_pkt_cnt = 0;
939 rt->mf6c_byte_cnt = 0;
940 rt->mf6c_wrong_if = 0;
942 rt->mf6c_stall = NULL;
944 /* link into table */
945 rt->mf6c_next = mf6ctable[hash];
946 mf6ctable[hash] = rt;
956 * collect delay statistics on the upcalls
959 collate(struct timeval *t)
969 TV_DELTA(tp, *t, delta);
978 #endif /* UPCALL_TIMING */
981 * Delete an mfc entry
984 del_m6fc(struct mf6cctl *mfccp)
987 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
989 struct sockaddr_in6 origin;
990 struct sockaddr_in6 mcastgrp;
995 origin = mfccp->mf6cc_origin;
996 mcastgrp = mfccp->mf6cc_mcastgrp;
997 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
999 MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s",
1000 ip6_sprintf(ip6bufo, &origin.sin6_addr),
1001 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
1005 nptr = &mf6ctable[hash];
1006 while ((rt = *nptr) != NULL) {
1007 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
1008 &rt->mf6c_origin.sin6_addr) &&
1009 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
1010 &rt->mf6c_mcastgrp.sin6_addr) &&
1011 rt->mf6c_stall == NULL)
1014 nptr = &rt->mf6c_next;
1018 return (EADDRNOTAVAIL);
1021 *nptr = rt->mf6c_next;
1022 free(rt, M_MRTABLE6);
1030 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
1034 if (sbappendaddr(&s->so_rcv,
1035 (struct sockaddr *)src,
1036 mm, (struct mbuf *)0) != 0) {
1047 * IPv6 multicast forwarding function. This function assumes that the packet
1048 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface
1049 * pointed to by "ifp", and the packet is to be relayed to other networks
1050 * that have members of the packet's destination IPv6 multicast group.
1052 * The packet is returned unscathed to the caller, unless it is
1053 * erroneous, in which case a non-zero return value tells the caller to
1056 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
1057 * this function is called in the originating context (i.e., not when
1058 * forwarding a packet from other node). ip6_output(), which is currently the
1059 * only function that calls this function is called in the originating context,
1060 * explicitly ensures this condition. It is caller's responsibility to ensure
1061 * that if this function is called from somewhere else in the originating
1062 * context in the future.
1065 X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
1074 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1075 #ifdef UPCALL_TIMING
1079 #endif /* UPCALL_TIMING */
1081 MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d",
1082 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1083 ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index);
1086 * Don't forward a packet with Hop limit of zero or one,
1087 * or a packet destined to a local-only group.
1089 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
1090 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1095 * Source address check: do not forward packets with unspecified
1096 * source. It was discussed in July 2000, on ipngwg mailing list.
1097 * This is rather more serious than unicast cases, because some
1098 * MLD packets can be sent with the unspecified source address
1099 * (although such packets must normally set 1 to the hop limit field).
1101 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
1102 IP6STAT_INC(ip6s_cantforward);
1103 if (V_ip6_log_time + V_ip6_log_interval < time_uptime) {
1104 V_ip6_log_time = time_uptime;
1107 "from %s to %s nxt %d received on %s\n",
1108 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1109 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1111 if_name(m->m_pkthdr.rcvif));
1119 * Determine forwarding mifs from the forwarding cache table
1121 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
1122 MRT6STAT_INC(mrt6s_mfc_lookups);
1124 /* Entry exists, so forward if necessary */
1127 return (ip6_mdq(m, ifp, rt));
1131 * If we don't have a route for packet's origin,
1132 * Make a copy of the packet & send message to routing daemon.
1134 MRT6STAT_INC(mrt6s_no_route);
1135 MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s",
1136 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1137 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1140 * Allocate mbufs early so that we don't do extra work if we
1141 * are just going to fail anyway.
1143 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT);
1148 mb0 = m_copym(m, 0, M_COPYALL, M_NOWAIT);
1150 * Pullup packet header if needed before storing it,
1151 * as other references may modify it in the meantime.
1153 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
1154 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
1156 free(rte, M_MRTABLE6);
1161 /* is there an upcall waiting for this packet? */
1162 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
1163 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
1164 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
1165 &rt->mf6c_origin.sin6_addr) &&
1166 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1167 &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL))
1174 struct omrt6msg *oim;
1176 /* no upcall, so make a new entry */
1177 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT);
1179 free(rte, M_MRTABLE6);
1185 * Make a copy of the header to send to the user
1188 mm = m_copym(mb0, 0, sizeof(struct ip6_hdr), M_NOWAIT);
1190 free(rte, M_MRTABLE6);
1192 free(rt, M_MRTABLE6);
1198 * Send message to routing daemon
1200 sin6.sin6_addr = ip6->ip6_src;
1205 switch (V_ip6_mrouter_ver) {
1208 oim = mtod(mm, struct omrt6msg *);
1209 oim->im6_msgtype = MRT6MSG_NOCACHE;
1214 im = mtod(mm, struct mrt6msg *);
1215 im->im6_msgtype = MRT6MSG_NOCACHE;
1219 free(rte, M_MRTABLE6);
1221 free(rt, M_MRTABLE6);
1226 MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel");
1227 for (mifp = mif6table, mifi = 0;
1228 mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++)
1231 switch (V_ip6_mrouter_ver) {
1234 oim->im6_mif = mifi;
1242 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1243 log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
1244 "socket queue full\n");
1245 MRT6STAT_INC(mrt6s_upq_sockfull);
1246 free(rte, M_MRTABLE6);
1248 free(rt, M_MRTABLE6);
1253 MRT6STAT_INC(mrt6s_upcalls);
1255 /* insert new entry at head of hash chain */
1256 bzero(rt, sizeof(*rt));
1257 rt->mf6c_origin.sin6_family = AF_INET6;
1258 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
1259 rt->mf6c_origin.sin6_addr = ip6->ip6_src;
1260 rt->mf6c_mcastgrp.sin6_family = AF_INET6;
1261 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
1262 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
1263 rt->mf6c_expire = UPCALL_EXPIRE;
1265 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
1267 /* link into table */
1268 rt->mf6c_next = mf6ctable[hash];
1269 mf6ctable[hash] = rt;
1270 /* Add this entry to the end of the queue */
1271 rt->mf6c_stall = rte;
1273 /* determine if q has overflowed */
1277 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
1278 if (++npkts > MAX_UPQ6) {
1279 MRT6STAT_INC(mrt6s_upq_ovflw);
1280 free(rte, M_MRTABLE6);
1286 /* Add this entry to the end of the queue */
1293 #ifdef UPCALL_TIMING
1295 #endif /* UPCALL_TIMING */
1303 * Clean up cache entries if upcalls are not serviced
1304 * Call from the Slow Timeout mechanism, every half second.
1307 expire_upcalls(void *unused)
1310 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
1313 struct mf6c *mfc, **nptr;
1318 for (i = 0; i < MF6CTBLSIZ; i++) {
1319 if (n6expire[i] == 0)
1321 nptr = &mf6ctable[i];
1322 while ((mfc = *nptr) != NULL) {
1323 rte = mfc->mf6c_stall;
1325 * Skip real cache entries
1326 * Make sure it wasn't marked to not expire (shouldn't happen)
1330 mfc->mf6c_expire != 0 &&
1331 --mfc->mf6c_expire == 0) {
1332 MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)",
1333 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
1334 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
1336 * drop all the packets
1337 * free the mbuf with the pkt, if, timing info
1340 struct rtdetq *n = rte->next;
1342 free(rte, M_MRTABLE6);
1344 } while (rte != NULL);
1345 MRT6STAT_INC(mrt6s_cache_cleanups);
1348 *nptr = mfc->mf6c_next;
1349 free(mfc, M_MRTABLE6);
1351 nptr = &mfc->mf6c_next;
1355 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
1356 expire_upcalls, NULL);
1360 * Packet forwarding routine once entry in the cache is made
1363 ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
1365 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1368 int plen = m->m_pkthdr.len;
1369 struct in6_addr src0, dst0; /* copies for local work */
1370 u_int32_t iszone, idzone, oszone, odzone;
1374 * Don't forward if it didn't arrive from the parent mif
1377 mifi = rt->mf6c_parent;
1378 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
1379 /* came in the wrong interface */
1380 MRT6_DLOG(DEBUG_FORWARD,
1381 "wrong if: ifid %d mifi %d mififid %x", ifp->if_index,
1382 mifi, mif6table[mifi].m6_ifp->if_index);
1383 MRT6STAT_INC(mrt6s_wrong_if);
1384 rt->mf6c_wrong_if++;
1386 * If we are doing PIM processing, and we are forwarding
1387 * packets on this interface, send a message to the
1390 /* have to make sure this is a valid mif */
1391 if (mifi < nummifs && mif6table[mifi].m6_ifp)
1392 if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
1394 * Check the M_LOOP flag to avoid an
1395 * unnecessary PIM assert.
1396 * XXX: M_LOOP is an ad-hoc hack...
1398 static struct sockaddr_in6 sin6 =
1399 { sizeof(sin6), AF_INET6 };
1404 struct omrt6msg *oim;
1407 mm = m_copym(m, 0, sizeof(struct ip6_hdr),
1411 mm->m_len < sizeof(struct ip6_hdr)))
1412 mm = m_pullup(mm, sizeof(struct ip6_hdr));
1420 switch (V_ip6_mrouter_ver) {
1423 oim = mtod(mm, struct omrt6msg *);
1424 oim->im6_msgtype = MRT6MSG_WRONGMIF;
1429 im = mtod(mm, struct mrt6msg *);
1430 im->im6_msgtype = MRT6MSG_WRONGMIF;
1438 for (mifp = mif6table, iif = 0;
1439 iif < nummifs && mifp &&
1440 mifp->m6_ifp != ifp;
1444 switch (V_ip6_mrouter_ver) {
1448 sin6.sin6_addr = oim->im6_src;
1453 sin6.sin6_addr = im->im6_src;
1457 MRT6STAT_INC(mrt6s_upcalls);
1459 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1460 MRT6_DLOG(DEBUG_ANY,
1461 "ip6_mrouter socket queue full");
1462 MRT6STAT_INC(mrt6s_upq_sockfull);
1464 } /* if socket Q full */
1467 } /* if wrong iif */
1469 /* If I sourced this packet, it counts as output, else it was input. */
1470 if (m->m_pkthdr.rcvif == NULL) {
1471 /* XXX: is rcvif really NULL when output?? */
1472 mif6table[mifi].m6_pkt_out++;
1473 mif6table[mifi].m6_bytes_out += plen;
1475 mif6table[mifi].m6_pkt_in++;
1476 mif6table[mifi].m6_bytes_in += plen;
1479 rt->mf6c_byte_cnt += plen;
1482 * For each mif, forward a copy of the packet if there are group
1483 * members downstream on the interface.
1485 src0 = ip6->ip6_src;
1486 dst0 = ip6->ip6_dst;
1487 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
1488 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
1489 IP6STAT_INC(ip6s_badscope);
1492 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
1493 if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
1495 * check if the outgoing packet is going to break
1497 * XXX For packets through PIM register tunnel
1498 * interface, we believe a routing daemon.
1500 if (!(mif6table[rt->mf6c_parent].m6_flags &
1502 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
1503 if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
1505 in6_setscope(&dst0, mif6table[mifi].m6_ifp,
1509 IP6STAT_INC(ip6s_badscope);
1515 mifp->m6_bytes_out += plen;
1516 if (mifp->m6_flags & MIFF_REGISTER)
1517 register_send(ip6, mifp, m);
1519 phyint_send(ip6, mifp, m);
1526 phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
1529 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1531 struct mbuf *mb_copy;
1532 struct ifnet *ifp = mifp->m6_ifp;
1537 * Make a new reference to the packet; make sure that
1538 * the IPv6 header is actually copied, not just referenced,
1539 * so that ip6_output() only scribbles on the copy.
1541 mb_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT);
1543 (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
1544 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
1545 if (mb_copy == NULL) {
1548 /* set MCAST flag to the outgoing packet */
1549 mb_copy->m_flags |= M_MCAST;
1552 * If we sourced the packet, call ip6_output since we may devide
1553 * the packet into fragments when the packet is too big for the
1554 * outgoing interface.
1555 * Otherwise, we can simply send the packet to the interface
1558 if (m->m_pkthdr.rcvif == NULL) {
1559 struct ip6_moptions im6o;
1560 struct epoch_tracker et;
1562 im6o.im6o_multicast_ifp = ifp;
1563 /* XXX: ip6_output will override ip6->ip6_hlim */
1564 im6o.im6o_multicast_hlim = ip6->ip6_hlim;
1565 im6o.im6o_multicast_loop = 1;
1566 NET_EPOCH_ENTER(et);
1567 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o,
1571 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1572 (uint16_t)(mifp - mif6table), error);
1577 * If configured to loop back multicasts by default,
1578 * loop back a copy now.
1581 ip6_mloopback(ifp, m);
1584 * Put the packet into the sending queue of the outgoing interface
1585 * if it would fit in the MTU of the interface.
1587 linkmtu = IN6_LINKMTU(ifp);
1588 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
1589 struct sockaddr_in6 dst6;
1591 bzero(&dst6, sizeof(dst6));
1592 dst6.sin6_len = sizeof(struct sockaddr_in6);
1593 dst6.sin6_family = AF_INET6;
1594 dst6.sin6_addr = ip6->ip6_dst;
1596 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
1598 * We just call if_output instead of nd6_output here, since
1599 * we need no ND for a multicast forwarded packet...right?
1601 m_clrprotoflags(m); /* Avoid confusing lower layers. */
1602 error = (*ifp->if_output)(ifp, mb_copy,
1603 (struct sockaddr *)&dst6, NULL);
1604 MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
1605 (uint16_t)(mifp - mif6table), error);
1608 * pMTU discovery is intentionally disabled by default, since
1609 * various router may notify pMTU in multicast, which can be
1610 * a DDoS to a router
1612 if (V_ip6_mcast_pmtu)
1613 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
1615 MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s "
1616 "g %s size %d (discarded)", if_name(ifp),
1617 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1618 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
1619 mb_copy->m_pkthdr.len);
1620 m_freem(mb_copy); /* simply discard the packet */
1626 register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
1629 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1632 int i, len = m->m_pkthdr.len;
1633 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
1634 struct mrt6msg *im6;
1636 MRT6_DLOG(DEBUG_ANY, "src %s dst %s",
1637 ip6_sprintf(ip6bufs, &ip6->ip6_src),
1638 ip6_sprintf(ip6bufd, &ip6->ip6_dst));
1639 PIM6STAT_INC(pim6s_snd_registers);
1641 /* Make a copy of the packet to send to the user level process. */
1642 mm = m_gethdr(M_NOWAIT, MT_DATA);
1645 mm->m_data += max_linkhdr;
1646 mm->m_len = sizeof(struct ip6_hdr);
1648 if ((mm->m_next = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
1652 i = MHLEN - M_LEADINGSPACE(mm);
1655 mm = m_pullup(mm, i);
1658 /* TODO: check it! */
1659 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
1662 * Send message to routing daemon
1664 sin6.sin6_addr = ip6->ip6_src;
1666 im6 = mtod(mm, struct mrt6msg *);
1667 im6->im6_msgtype = MRT6MSG_WHOLEPKT;
1670 im6->im6_mif = mif - mif6table;
1672 /* iif info is not given for reg. encap.n */
1673 MRT6STAT_INC(mrt6s_upcalls);
1675 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
1676 MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full");
1677 MRT6STAT_INC(mrt6s_upq_sockfull);
1684 * pim6_encapcheck() is called by the encap6_input() path at runtime to
1685 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
1689 pim6_encapcheck(const struct mbuf *m __unused, int off __unused,
1690 int proto __unused, void *arg __unused)
1693 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
1694 return (8); /* claim the datagram. */
1698 * PIM sparse mode hook
1699 * Receives the pim control messages, and passes them up to the listening
1700 * socket, using rip6_input.
1701 * The only message processed is the REGISTER pim message; the pim header
1702 * is stripped off, and the inner packet is passed to register_mforward.
1705 pim6_input(struct mbuf *m, int off, int proto, void *arg __unused)
1707 struct pim *pim; /* pointer to a pim struct */
1708 struct ip6_hdr *ip6;
1712 PIM6STAT_INC(pim6s_rcv_total);
1717 pimlen = m->m_pkthdr.len - off;
1718 if (pimlen < PIM_MINLEN) {
1719 PIM6STAT_INC(pim6s_rcv_tooshort);
1720 MRT6_DLOG(DEBUG_PIM, "PIM packet too short");
1722 return (IPPROTO_DONE);
1726 * if the packet is at least as big as a REGISTER, go ahead
1727 * and grab the PIM REGISTER header size, to avoid another
1728 * possible m_pullup() later.
1730 * PIM_MINLEN == pimhdr + u_int32 == 8
1731 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
1733 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
1736 * Make sure that the IP6 and PIM headers in contiguous memory, and
1737 * possibly the PIM REGISTER header
1739 if (m->m_len < off + minlen) {
1740 m = m_pullup(m, off + minlen);
1742 IP6STAT_INC(ip6s_exthdrtoolong);
1743 return (IPPROTO_DONE);
1746 ip6 = mtod(m, struct ip6_hdr *);
1747 pim = (struct pim *)((caddr_t)ip6 + off);
1749 #define PIM6_CHECKSUM
1750 #ifdef PIM6_CHECKSUM
1755 * Validate checksum.
1756 * If PIM REGISTER, exclude the data packet
1758 if (pim->pim_type == PIM_REGISTER)
1759 cksumlen = PIM_MINLEN;
1763 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
1764 PIM6STAT_INC(pim6s_rcv_badsum);
1765 MRT6_DLOG(DEBUG_PIM, "invalid checksum");
1767 return (IPPROTO_DONE);
1770 #endif /* PIM_CHECKSUM */
1772 /* PIM version check */
1773 if (pim->pim_ver != PIM_VERSION) {
1774 PIM6STAT_INC(pim6s_rcv_badversion);
1775 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR,
1776 "incorrect version %d, expecting %d",
1777 pim->pim_ver, PIM_VERSION);
1779 return (IPPROTO_DONE);
1782 if (pim->pim_type == PIM_REGISTER) {
1784 * since this is a REGISTER, we'll make a copy of the register
1785 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
1788 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
1791 struct ip6_hdr *eip6;
1794 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
1797 PIM6STAT_INC(pim6s_rcv_registers);
1799 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
1800 MRT6_DLOG(DEBUG_PIM, "register mif not set: %d",
1803 return (IPPROTO_DONE);
1806 reghdr = (u_int32_t *)(pim + 1);
1808 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
1809 goto pim6_input_to_daemon;
1814 if (pimlen < PIM6_REG_MINLEN) {
1815 PIM6STAT_INC(pim6s_rcv_tooshort);
1816 PIM6STAT_INC(pim6s_rcv_badregisters);
1817 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet "
1818 "size too small %d from %s",
1819 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
1821 return (IPPROTO_DONE);
1824 eip6 = (struct ip6_hdr *) (reghdr + 1);
1825 MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d",
1826 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1827 ip6_sprintf(ip6bufd, &eip6->ip6_dst),
1828 ntohs(eip6->ip6_plen));
1830 /* verify the version number of the inner packet */
1831 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1832 PIM6STAT_INC(pim6s_rcv_badregisters);
1833 MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) "
1834 "of the inner packet",
1835 (eip6->ip6_vfc & IPV6_VERSION));
1837 return (IPPROTO_DONE);
1840 /* verify the inner packet is destined to a mcast group */
1841 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
1842 PIM6STAT_INC(pim6s_rcv_badregisters);
1843 MRT6_DLOG(DEBUG_PIM, "inner packet of register "
1844 "is not multicast %s",
1845 ip6_sprintf(ip6bufd, &eip6->ip6_dst));
1847 return (IPPROTO_DONE);
1851 * make a copy of the whole header to pass to the daemon later.
1853 mcp = m_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT);
1855 MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: "
1856 "could not copy register head");
1858 return (IPPROTO_DONE);
1862 * forward the inner ip6 packet; point m_data at the inner ip6.
1864 m_adj(m, off + PIM_MINLEN);
1865 MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: "
1866 "src %s, dst %s, mif %d",
1867 ip6_sprintf(ip6bufs, &eip6->ip6_src),
1868 ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num);
1870 if_simloop(mif6table[reg_mif_num].m6_ifp, m,
1871 dst.sin6_family, 0);
1873 /* prepare the register head to send to the mrouting daemon */
1878 * Pass the PIM message up to the daemon; if it is a register message
1879 * pass the 'head' only up to the daemon. This includes the
1880 * encapsulator ip6 header, pim header, register header and the
1881 * encapsulated ip6 header.
1883 pim6_input_to_daemon:
1884 return (rip6_input(&m, &off, proto));
1888 ip6_mroute_modevent(module_t mod, int type, void *unused)
1893 MROUTER6_LOCK_INIT();
1897 pim6_encap_cookie = ip6_encap_attach(&ipv6_encap_cfg,
1899 if (pim6_encap_cookie == NULL) {
1900 printf("ip6_mroute: unable to attach pim6 encap\n");
1901 MIF6_LOCK_DESTROY();
1902 MFC6_LOCK_DESTROY();
1903 MROUTER6_LOCK_DESTROY();
1907 ip6_mforward = X_ip6_mforward;
1908 ip6_mrouter_done = X_ip6_mrouter_done;
1909 ip6_mrouter_get = X_ip6_mrouter_get;
1910 ip6_mrouter_set = X_ip6_mrouter_set;
1911 mrt6_ioctl = X_mrt6_ioctl;
1915 if (V_ip6_mrouter != NULL)
1918 if (pim6_encap_cookie) {
1919 ip6_encap_detach(pim6_encap_cookie);
1920 pim6_encap_cookie = NULL;
1922 X_ip6_mrouter_done();
1923 ip6_mforward = NULL;
1924 ip6_mrouter_done = NULL;
1925 ip6_mrouter_get = NULL;
1926 ip6_mrouter_set = NULL;
1929 MIF6_LOCK_DESTROY();
1930 MFC6_LOCK_DESTROY();
1931 MROUTER6_LOCK_DESTROY();
1935 return (EOPNOTSUPP);
1941 static moduledata_t ip6_mroutemod = {
1943 ip6_mroute_modevent,
1947 DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY);